How to insert a new key value pair in array in php? [duplicate]

Question

I've an array as follows named $test_package_data. For the reference I'm printing first two elements of it:

Now I want to add a new key-value pair named [count] => '$some_value' in this array in every element after the key-value pair [test_pack_purchase_date](say after [test_pack_purchase_date] => 255. How should I do this? Can anyone help me in this regard? Thanks in advance.

You can not really change the order in an array apart from deleting, adding, readding. — str
– str, Commented Jul 8, 2013 at 10:37
you can't, not really. PHP assoc arrays are, essentialy structs. That means that, in order for the key's to be sorted, the array has to be reconstructed. appending the key and then writing up your own uksort function might work, or json_encode, and str_replace-ing your new key-value pair in the correct position before json_decode($str, true) — Elias Van Ootegem
– Elias Van Ootegem, Commented Jul 8, 2013 at 10:50

Martijn · Accepted Answer · 2020-12-08 09:23:48Z

135

If you are creating new array then try this :

$arr = ['key' => 'value'];

And if array is already created then try this :

$arr['key'] = 'value';

edited Dec 8, 2020 at 9:23

Martijn

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answered Jul 8, 2013 at 10:37

dakshbhatt21

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2 Comments

Kalpesh Singh Over a year ago

When I do this, I get only last element ...

for($i= 1; $i<=$5; $i++) {     $EACH_POST_QUERY = mysql_query("SELECT item_id FROM likes WHERE item_id='$i'");     $EACH_POST_TOTAL_LIKES = mysql_num_rows($EACH_POST_QUERY);     $EACH_POST_RESULT = array($i => $EACH_POST_TOTAL_LIKES); }

dakshbhatt21 Over a year ago

@KalpeshSingh: because you are creating new array every time, change the last line with this $EACH_POST_RESULT[] = $EACH_POST_TOTAL_LIKES; And I highly recommend you to use PDO instead of deprecated mysql_connect(), you can find more info about PDO here

Goutam Pal · Accepted Answer · 2013-07-08 10:48:51Z

8

foreach($test_package_data as $key=>$data ) {

   $category_detail_arr = $test_package_data[$key]['category_detail'];

   foreach( $category_detail_arr as $i=>$value ) {
     $test_package_data[$key]['category_detail'][$i]['count'] = $some_value;////<----Here
   }

}

answered Jul 8, 2013 at 10:48

Goutam Pal

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Comments

Rakib Hasan Sabbir · Accepted Answer · 2020-12-08 09:20:14Z

2

To add:

$arr["key"] = "value";

Then simply return $arr

Can't return directly like this way return $arr["key"] = "value";

edited Dec 8, 2020 at 9:20

answered Dec 7, 2020 at 17:46

Rakib Hasan Sabbir

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Comments

Mohammad Usman · Accepted Answer · 2018-04-02 13:28:47Z

-4

Try this:

foreach($array as $k => $obj) { 
    $obj->{'newKey'} = "value"; 
}

edited Apr 2, 2018 at 13:28

Mohammad Usman

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answered Apr 2, 2018 at 13:08

Anitha

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1 Comment

Evan Darwin Over a year ago

The question is about PHP associative arrays, and this does not fully answer their question.

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